I am using the latest Lightroom Classic (version 11) in my iMac, which is running Catalina (10.15). When I clicked the "Guided" in Transform" panel, the software adjusted the images. It does not allow me to draw lines. When I clicked the image, it enlarged the image. When clicked again, the image went back to "Fit" size. Normally, when I click the "Guided", it should come out an enlarge box for me to draw the lines.
For reinstallation, I used the Cloud and clicked "Uninstall". I also deleted the preference. After uninstalling, I restarted the iMac and went into Adobe Cloud to install Lightroom again.
I tried uninstalling and reinstalling twice (2021-11-17). The problem still persists.
FYI, I have a MacBook Pro running the same version of MacOS and Lightroom. It does not have this problem.