It happens sometimes that you go to open the advanced find dialog and ribbon is all messed up, icons alignment compromised and tabs hidden somewhere…unusable!
As far as I know is not due to faulty customizations but it appears like browser cache/storage issue with CSS. While you are experiencing this strange behavior try to connect to the same organization with a different browser or even same browser in private mode and you’ll see that the new session is behaving properly.
Here at Apex we experienced this behavior on IE and Firefox hence looks like a cross-browser one.
So far we only experienced it on On-Premises deployments.
How to solve it?
Clean up browser’s local storage.
Open Developer Mode (basically hit F12 in almost any browser) and type the following command in the console:
Once you entered the command, refresh (F5) the Advanceed Find dialog window and everything should be back to normal!