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When I'm working between 2 boards a lot, I have them both open at the same time in different tabs in the same browser, I have 'pinned' the boards that I need open all the time and that way they stay open in my browser (and I don't accidentally close them) so I can flick between them without having to close either one down.
If you find that there are 2 boards that you're working intensely in, you could always use 2 bookmarks to easily be able to find them again should you close them by accident. I have set up a Trello folder in my Bookmarks bar where I've bookmarked the ones that I use all the time, so that I don't have to worry about finding them again. Just open another tab, click on the folder and open the next one that I want, without having to close the original one down.
I hope this helps :)
If you had to thrive a new habit during a lockdown, what would it be? Trello
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