The top and bottom toolbars are taking a lot of screen space, even though I am using a huge phone. Can you consider changing some buttons into menus, or shrinking the size of the buttons?
Just to clarify, you mean the sections with the sub, mod, fav, and all tabs on the top, and the feed, explore, profile, and settings buttons on the bottom? I've already thought about how to make the top portion customizable, so hiding the sub, mod, fav, and all tabs could be an option to put in the settings. As for the bottom portion, I feel that it's necessary to keep, especially considering many mobile apps have their global navigation in the same spot. It is possible, though, that we could make it so it hides on scroll, or maybe have a button that toggles its visibility.
Can you provide an option for showing the instances of posts and users?
You can already see the instance of a user or magazine. If you click the little "@" button next to a user or magazine name, it will display the host (the button's not there, the user or magazine is on the same instance as you). Additionally, if you actually click on the user or magazine name (not the "@" button), it will pull up a detailed user/magazine profile, of which, near the top, is listed the full user/magazine reference name (with the instance), like https://lemmy.world/c/fediverse or @randomusername. If you meant always show the instance of a user/magazine (instead of replacing it with an "@" button), I've also thought of adding that as an option in the settings.
Can you provide an option to disable swipe left/right gestures?
If you're referring to the swipe gestures on the screens with tabs, that actually comes by default with the framework, but I can see if there's an easy way to disable it.