Not an expert so definitely speak to your legal team for final decision, but here is my best shot
However software can be copyrighted similar to a book, but you need the code. With Glide there is no code so you can’t copyright it the same way. With Glide (IMO) its more of design/creative work which can be copyrighted but it has to be original, due to the components being pre made and limited inside Glide, i’m not sure you will can really copyright it easily. You cannot copyright ideas, procedures, workflows, etc… they would more come under different type of protection like a patent. e.g if you look at Microsoft Excel and Google Sheets, you could argue they are very similar, if you know how to use one then you can use the other very comfortably.
Remember the objective of Glide it do as much as possible for the user/developer and reduce the amount of work the user has to do, by this very nature, the amount of original work you are doing yourself will be very limited.
Trademark would apply to your logo/tag line/phrase, that you can definitely register and has nothing to do with Glide.