How do I save changes to Device Settings

I am absolutely new to this plugin and I’m sure this question has been asked so forgive me. It is not obvious to me how to save changes I make to device settings. I don’t see a save button or anything like it. Any help is appreciated.

Welcome !
Which device settings ? For device Variable and attributes : just move to somewhere else ( the loss of focus is triggering the saving ) but some like attributes require a luup reload.