Frequently Asked Questions
In macOS Big Sur, Apple has decided that icons in the toolbar in an app's preferences should be centered, as seen in here in Moom:
If you don't like this style, and would rather have things left-aligned, here's what you need to do.
First, open the app's preferences and right-click in the toolbar area; select Customize Toolbar… from the pop-up menu. That will create a drop-down sheet and some dancing icons in the toolbar.
You'll also see two boxed empty areas on each end of the toolbar. Drag the leftmost empty box out of the toolbar, like this:
When you drag the empty box (it's a flexible space) out of the toolbar, you'll see all the icons move to the left. Click Done, and Moom's prefs will now be left-aligned:
If you ever decide you want the centered toolbar icons back, repeat this process, but drag the default set (found at the bottom of the drop-down panel) up into the toolbar area.