Arc Browser Issues

Can someone help me with these issues

1. I’ve been using Arc for a while and made a couple of Chrome extensions. They work fine on Edge and Brave with side panel support, but Arc doesn’t seem to have it. Is there a way to enable it?
2. Arc doesn’t have a traditional home page like other browsers. Can I add one? I need it for my extension.
3. When I open a new window in Arc, it duplicates the current one with all the same tabs, which I don’t want. Is there a fix for this?