How to delete one browser while keep the other active

[sanbox man]

I have 2 different browsers (2 different brands) both under SBIE; I close down one browser, and then some time later
when I decide I need the same browser again, SBIE says it's actually running (in the sandbox but not on my screen
because earlier I had closed it. What I usually do is shut the remaining open browser
(there was two to start with remember) and delete contents and restart both under SBIE. So my question is there a simpler way?
Ideally I would I usually close the browser and reopen it again without again to start from scratch.

[nanana1]

You can create one sandbox each for your different browsers and decide if you want their contents to be automatically deleted when you close your browser