Small QoL Improvements

[Hiveer]

Is there any way to save the UI settings on one character to become the default UI for other alt characters and/or new ones on the account?

Not currently.
Until they implement that, though, you could do this if you play on PC:

1. Backup ALL of your character's settings on the cloud.
2. Navigate to your documents, and locate the FFXIV folder (path is usually something like C:\Users\Yourname\Documents\My Games\FINAL FANTASY XIV - A Realm Reborn )
3. Delete all the character settings folders (the ones named something like FFXIV_CHR0040002E0000000)
4. Reopen the game, download your main's character settings again.
5. In the FFXIV folder, create a placemarker file of any kind to identify it as your main's settings
6. Download your alt's game settings. Close the game.
7. Copy the file "UISAVE.DAT" located in your main's folder. Paste it into your alt folders.
8. Open the game again. You will now have your main's UI settings available to those characters. You can do this for other things such as keybinds by copypasting the relative save files, too.

It takes less time than all of these steps make it seem.