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Any simple character would do. it has been reported in the Designer bug forum and the the moderator said it's a known issue. https://forum.affinity.serif.com/index.php?/topic/115234-cannot-change-the-shortcuts-for-decrease-and-increase-brush-size-in-pixel-persona/

I need to change the keyboard shortcuts for the Increase and Decrease Brush Size action in the Pixel persona because of a French keyboard . Go to Preferences > Keyboard Shortcut Select "Pixel" in the first menu and "Paint Brush Tool" in the second menu (or any tool with variable size) Change the keyboard shortcuts for the "Increase and Decrease Brush Size" shortcuts to your liking Close preferences Check that the new shortcuts work as expected (they should) Quit Designer Reopen Designer Goto Preferences > Keyboard Shortcuts Select the tool you've changed the shortcuts The increase and decrease brush size shortcuts reverted to [ and ] This only happens with the Pixel persona tools, NOT the Designer persona tools. OSX 10.15.3

I want to change the keyboard shortcut for the increase and decrease brush size in the pixel persona because brackets on a French keyboard are impossible without modifiers. No matter what I do, the changes are not saved with the pixel persona's tools. It works but as soon as I quit and reopen designer the shortcuts revert back to brackets. No problem with the Designer persona. Any help appreciated.