Why do you want to move from mix?
F-Droid
F-Droid is an installable catalogue of FOSS (Free and Open Source Software) applications for the Android platform. The client makes it easy to browse, install, and keep track of updates on your device.
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I've been using Mixplorer for years because is simply the best file manager on android, but I try just using open source.
But the reasons I'm finally moving is that it doesn't update regularly and a couple days ago I find it making connections to google and telegram.
Are you using the play store version? I have been using the XDA version for years. It hasn't made any requests so far.
I have been using Material files for quite a while now and I really enjoy it. If I want "dual-pane mode" then I just use the "New window" button and split those two.
Thanks, I think thats what I'll do. I just don't like the way it displays thumbnails