If you are after a dual-panel file explorer/Finder for MacOSX, try this software, been using this for a while and absolutely loved it.
Similar to this; this time they only run 15% discount; not bad if you after a Finder replacement.
Tons of Features
• Dropbox integration
Full Dropbox integration. Just link your account and you're all set up
• Modules everywhere
Fully customize your browser window with our new simple drag and drop module system.
• FolderSync
FolderSync is Cocoatech's Folder Comparison and Synchronization tool. And it's powerful.
• Folder Merging
Merge contents of two folders when copying/moving instead of overwriting.
• Arranging and Grouping items
Arrange files in a group based on a specific file attribute.
• Editable Path Navigator
Directly type in the Path Navigator to get to your files quickly.
• One-Click Dual Pane Copy
Use Path Finder's intuitive dual-pane browser to copy files from one pane to the next, with just a single click.
• Secure Delete
Secure delete using 1, 7 or 35 passes on any volume type.
Thanks OP for highlighting a solution I didn’t know existed. I’ve recently had a hackintosh built running Catalina, coming from Sierra I’m not a fan of finder ditching the ‘cover flow’ view mode and replacing it with the useless gallery view. Does pathfinder have something similar to cover flow? As a photographer I used this all the time.