Importing options missing LightRoom Classic

P.S. a recommendation for future postings. I see you are new to the community. I have included a link below on community tips. One point being to avoid using the attach button for posting screen captures, screenshots, and other images. (  jpeg, png, etc)  To instead use the insert Photo button. Just use the insert advancements for documents like crash logs, text files, PDF files.

Some members may have problems viewing the attachments. Some may just simply not open them. And it is a lot more efficient if they are visible in the posting straight up.

(Ref 1) Community How-To Guide - Tips & Best Practices

This screen capture from that document:

Authors problem (I took the liberty of copying authors screen capture, annotating it, and posting that copy):

On the import screen, right click on the gray area where the panels are not occupying space. In the screen that shows up, select those misbehaving panels (assuming they are not checked for visibility)

and see:

When Panels, Modules, Tools and More Go Missing in Lightroom : Laura Shoe

Right click one of the panel headers (like File handling), and choose File renaming and Destination from the context menu.