How to apply a change to all the AppBars on all pages at once? Converting AppBar to a component?

Hope everyone is having fun with FF! There are many pages, let's say, 100 pages. On each page, there is the same AppBar. I want the AppBar the same across the app. So if AppBar can be a component, it would be perfect like Drawer. But apparently not possible.

What's the best practice to maintain AppBar considering there are many pages with the same AppBar and sometimes you need to modify AppBar? Maybe making Leading, Title and Actions three components?

Maybe I found the answer while I was writing this question here. Any other suggestions?

Thanks!