Obsidian - Connected Notes 4+

I love how Obsidian has revolutionized the cloud-synced note-taking/second-brain category with simple Markdown files kept on every device. I’m a paying Obsidian Sync subscriber and happy to support the project.
Having said that, the iOS experience really needs some love. It should be much easier to (1) move between vaults (projects) and (2) move between navigation and search. The mobile UI is a small customization of the desktop experience, where those tasks don’t present a challenge, but fail miserably on mobile. e.g. doing a quick search requires opening a dropdown, switching to search, running the search, then using the dropdown again to revert to nav mode!
It should be possible to have multiple vaults open at same time, just like the desktop app can have multiple windows open, each with their own vault.
There also needs to be iOS widgets to open specific files quickly – that should be an easy quick win for the app as it doesn’t require any UI re-work.

I’m a list maker, note taker, record keeper and I always have been. During my life I’ve bounced between numerous apps and programs - both paid and free - to try to find something that fit my needs.
Without fail I would always end up unsatisfied at the restrictions of what I was using and would revert back to my physical sticky notes, notebooks, etc. I have notebooks and lists for my paid bills, my recipes, gaming notes, writing notes - they’re everywhere in my house. It sounds really lame but there’s nothing more satisfying than having the information I need to use or review, and to have it all organised at my fingertips.
By chance, I was looking through apps that supported markdown editing for something I was working on when I stumbled across Obsidian. I usually don’t try apps aren’t widely used as I fear they will be clunky and bug-ridden, but I continue to be blown away by the sheer amount of options I have with Obsidian. I will gush on about this because the customisation, plug ins, and features? Stunning. I’m surprised this app is free. I’m currently in the process of throwing away my scrappy old notebooks because with this app I can digitise, organise and very neatly store everything I need. I’ve downloaded a copy of Obsidian to my PC as well.
Shout out to all those who worked hard to develop Obsidian and keep it running, and to all of the people that continue to contribute to it. You’ve all made my little note-taking heart very happy!

It’s all really good for a free app, not asking for anything no adds! Total banger.
The problem is I just don’t know how to exit the vault, I clicked all the buttons and tried searching on google on how to leave but nothing mentions a way out of the vault.
I deleted and redownload the app, since its still awesome, because that’s the only way I can go back to the vault screen.
If someone can tell me how to leave the vault it would be great and I understand that programming this would be a little bit much for an ask but is it possible to just add a button somewhere more visible to leave the vault because that would be really nice.