We have the new PDF24 Creator 7.6.1 released which fixes an odd GUI bug in the application window of the creator. If you have installed version 7.6.0 or version 7.5.0, we recommend to switch to the new version 7.6.1. You can download directly from https://www.pdf24.org/
If you have other issues, please report them by sending a mail to forum@pdf24.org.