Mail App window, fonts and colours select buttons don't work on iMac running macOS Tahoe 26.5

My Mail App Window, Fonts and Colors select buttons don't work on iMac Tahoe 26.5


[Re-Titled by Moderator]

Original Title: Mail App on iMac Tahoe 26.5

iMac 24″, macOS 26.5

Posted on Jun 2, 2026 3:39 PM

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Question marked as Top-ranking reply

Posted on Jun 2, 2026 3:56 PM

If a simple reboot of your Mac doesn’t fix things, see if the problem still happens in safe mode.  Safe mode will often correct weird software behavior by forcing the OS to clear caches, do disk repair and other self-maintenance and housekeeping and temporarily disables third-party mods.

How to use safe mode on your Mac - Apple Support 


You can exit safe mode by restarting your Mac normally, then reevaluate the problem.

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Question marked as Top-ranking reply

Jun 2, 2026 3:56 PM in response to beckyalden

If a simple reboot of your Mac doesn’t fix things, see if the problem still happens in safe mode.  Safe mode will often correct weird software behavior by forcing the OS to clear caches, do disk repair and other self-maintenance and housekeeping and temporarily disables third-party mods.

How to use safe mode on your Mac - Apple Support 


You can exit safe mode by restarting your Mac normally, then reevaluate the problem.

Mail App window, fonts and colours select buttons don't work on iMac running macOS Tahoe 26.5

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