Sorry to hear about this. Could you please share a screenshot of what the import panel looks like at your end so we may try reproducing the issue?
Also, which exact version of Lightroom are you using?
Here's a list of known issues with Lightroom running on Mac OS Mojave: Known issues - Running Lightroom Classic and Lightroom CC on macOS 10.14 Mojave
As you can see, the import panel comes u behind the side panels and the ability to collapse side panels is gone. I've had to close LR, reopen it, collapse the side panels and then insert the card prompting an import. I never had this issue before upgrading to Mojave a few days ago.
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Drop out of Full Screen mode and see if that solves the problem.
Thanks much. Dropping out of full screen mode seems to have solved the problem.