Unable to switch files while working on another

Hello friends. When I try to change files to other files previously opened and shown in document with its tab, I cannot change files leaving the current one open. I click on the file name and it doesn’t appear unless I close the previous one. Is this normal? Is there no way to have two documents open at the same time so they can be compared?
I have a 27-inch IMac with Os Catalina 10.15.7.

Hello @Alvarez

Can you record video of the issue for better visual understanding of it? Also provide version and installation type of Document Server that you are using.