I haven’t found a perfect Foss file explorer, so I use 2, material files and ghost commander.
Material files
Pros:
It shows the disks sizes
Can deal with compressed files (zip, 7zip, tar)
Multiple windows support
Cons:
You need to reset the app to update disk size and to show new ones
Images are cropped
Multiple windows are worst and not as intuitive as multiple panels
It have issues when trying to open files with other apps, particularly librera.
Ghost Commander
Pros:
Many personalization options
Dual panel
Light weight and fast
Cons:
Can’t deal with 7zip files
It’s only view mode is list view
Don’t show disks available space
One Foss app many people don’t know about that is worth mentioning is
Index which try to bring a linux desktop file manager to android.
I used this many years ago, but their privacy policy was awful. I checked it before posting and it’s way better now but it’s still not the best, from their Privacy page
“We do not sell, trade, or rent your personal information to third parties. However, we may share your information with trusted third-party service providers”
Use mixplorer if you are going to use a close source file manager, is more private with more features.