Boost For Lemmy

Hello everyone, new to Boost, I am coming over from Connect. I am really liking the experience so far but I had a few of questions about it.

I have been through the settings and could not find it and I wanted to know if there is a way to have the image lead a post in card view. I mean have all the information, title, everything shown after the image while you are scrolling?

Can you set your default scroll to All? I was able to make it Hot but it always goes back to Subscribed when I come back to the app.

Is there a way to subscribe to a community without having to visit it? You can block a community from the ellipses but I cannot find a subscribe.

Thank you all very much.