Since version 1.21.120 (GDK migration), main menu is not working as expected using left-handed mouse configuration on Windows.
Previous to 1.21.120: Clicking main button with mouse in left-handed configuration on “Play”, “Settings”… just works.
1.21.120 and abouve: Clicking main button with mouse in left-handed configuration on “Play”, “Settings”… no longer works. Minecraft only reacts if mouse is considered right-handed config.
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We're tracking this issue at MCPE-230276, so this ticket is being resolved and linked as a duplicate.
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