From your screenshot I can’t tell any unexpected behaviour. The formatting buttons are grayed out if no field is focused.
From which version did you update? Since 2.1.49 didn’t bring any new features, I guess your previous version was below 2.1.45 (when the new toolbar as introduced)?
You need to uninstall Frozen Fields. The functionality of Frozen Fields is now built-in, and the add-on causes this bug.
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