How can I find more applets than the ones on the budgie extra list?
They could be located on Github, or Gitlab. You would just have to search for them, etc. There is no one way to find them universally.
The majority of the applets comes with budgie extras and Budgie Desktop. A selection of third party applets that we know of is in Welcome -> Applets. To find more possible applets, I’d search github and such.
Hey bash is there any applet which can hide App indicator just like windows with that arrow to show all apps which are hidden. I am using that default applet (Appindicator applet as you can see in screenshot) and there are no settings available for that applet.
No. But pull requests are welcome to introduce such capability