I used Microsoft Edge before I switched to Brave and this was probably the only part that irked me, but I believe having the option to keep tabs private tabs open would be nice so when you open a private tab you can leave it to view later while still browsing regularly.
absolutely necessary feature, Brave is the only iOS browser working this way - except the inherent silliness os Safari - it would be great at least to have the option - it is the Firefox way - to choose in settings if closing them or keeping them open.