QUICK ANSWER
How Brush Size Usually Changes
In MECCHA CHAMELEON, brush size is usually adjusted in painting mode by holding the right mouse button / MOUSE2 and moving the mouse left or right. Do not just click the button once. You need to hold it while moving the mouse.
If the brush size still does not change, especially on Linux, Proton, or Mac through CrossOver, the issue may be related to mouse capture, Steam/Proton behavior, or Wine DirectInput settings rather than the normal brush control itself.
Hold Right Mouse / MOUSE2
plus
Move Left or Right
CORRECT CONTROL
Hold Right Mouse, Then Move Sideways
Brush size adjustment happens in painting mode. MOUSE2 usually means the right mouse button. The brush size control is not simply "click right mouse." Hold the right mouse button and move the mouse left or right while still holding it.
Move right for a larger brush and left for a smaller brush in current player-tested behavior. Exact behavior may vary by version, keybind, input device, or room state.
COMMON MISTAKE
Clicking Once Instead of Holding
Single clickNo size menu
Players may click right mouse once and expect a size menu, but a single click is not enough.
Wrong buttonMOUSE2 is right mouse
Some players confuse MOUSE2 with the middle mouse button. For this control, use right mouse.
Wrong stateUse painting mode
Try again after entering painting mode, then hold right mouse while moving horizontally.
CURSOR CAPTURE
What If the Cursor Jumps to the Top-Left?
Some players report that when the control fails, releasing the mouse button makes the cursor appear in the top-left corner. That points more toward a mouse capture or input layer issue than a normal gameplay setting.
This page does not claim one exact cause. The behavior may depend on the operating system, Proton version, CrossOver bottle, mouse, Steam settings, game version, and how the input layer captures the pointer.
LINUX / PROTON NOTES
Linux and Proton Troubleshooting
Some Linux players report brush size issues. Another Linux / Nobara player reported that brush size worked with Proton Experimental and a Razer Deathadder V2, but that should not be treated as a guaranteed fix or a required mouse.
Proton behavior can differ by distro, Proton version, mouse, Steam settings, and game version. A safe first step is trying Proton Experimental or another Proton version, then fully restarting Steam and the game before testing the right-mouse drag again.
MAC / CROSSOVER ADVANCED WORKAROUND
CrossOver / Wine MouseWarpOverride Note
Advanced CrossOver / Wine workaround: test the mouse-capture setting, restart the game, and check whether brush size changes again. Use this only if you already play through CrossOver or Wine, and switch back if it makes input worse.
Fully quit Steam and the game
Close both before editing bottle settings.
Open CrossOver
Select the Steam bottle you use for MECCHA CHAMELEON.
Use Run Command
Run regedit for that bottle.
Navigate to the Wine key
HKEY_CURRENT_USER\Software\Wine
Create DirectInput if needed
Look for or create a DirectInput key inside Wine.
Add MouseWarpOverride
Inside DirectInput, create a string value named MouseWarpOverride and set it to force.
Restart and test
Close Registry Editor, restart Steam and the game, then test painting mode again.
Advanced onlyOnly try this if you are comfortable editing Wine registry settings. Changing registry settings can affect the bottle. Consider backing up the bottle first.
WHAT NOT TO DO
Avoid Risky Brush Size Fixes
- Do not download unknown brush size fixes, DLLs, scripts, or executables.
- Do not assume a random config-file tweak is safe.
- Do not disable security settings just to test brush size.
- Do not confuse brush size with zoom controls.
BRUSH SIZE VS ZOOM
Brush Size Is Not Camera Zoom
Brush size and camera zoom are different controls. Zoom usually involves mouse wheel behavior. Brush size uses right mouse / MOUSE2 drag.
For zoom-specific help, use the How to Zoom Out guide.
Meccha Chameleon Brush Size FAQ
How do I change brush size in MECCHA CHAMELEON?
In painting mode, hold the right mouse button or MOUSE2 and move the mouse left or right. A single click is not enough.
Is MOUSE2 the middle mouse button?
Usually no. MOUSE2 normally means the right mouse button, not the mouse wheel click.
Why does clicking right mouse not change brush size?
The control is a hold-and-drag action. Hold right mouse and move horizontally while still holding the button.
Why does my cursor jump to the top-left?
Some players report this when brush size input fails. It points more toward a mouse capture or input layer issue than a normal gameplay setting.
Does this happen on Linux?
Some Linux and Proton players report brush size problems, but Linux itself should not be treated as the confirmed cause.
Should I try Proton Experimental?
Try Proton Experimental or another Proton version, then restart Steam and the game. If the brush size still does not change, switch back to your previous Proton version and report the input issue with your OS, Proton version, and mouse setup.
Can CrossOver cause brush size problems?
Some Mac players using CrossOver report mouse capture or pointer behavior that can affect right-mouse dragging, but results vary by bottle and settings.
What is the MouseWarpOverride CrossOver workaround?
It is an advanced community-reported Wine registry change: add a DirectInput key under HKEY_CURRENT_USER\Software\Wine and set the MouseWarpOverride string value to force.
How should I test the CrossOver registry fix?
Advanced CrossOver / Wine workaround: test the mouse-capture setting, restart the game, and check whether brush size changes again. Use this only if you already play through CrossOver or Wine, and switch back if it makes input worse.
Is brush size the same as zoom?
No. Brush size uses right mouse or MOUSE2 drag. Zoom usually uses mouse wheel behavior.
Should I download a brush size fix?
No. Do not download unknown fixes, DLLs, scripts, or executables for brush size problems.
Where can I learn basic controls?
Use the Meccha Chameleon Controls guide for the broader keyboard and mouse control reference.
