SDL Multiterm 2021 Widget not opening when pressing CTRL-ALT+F8

I have recently installed SDL Multiterm 2021 and I have found that the SDL Multiterm 2021 Widget was not automatically installed in my computer. I have downloaded it from the AppStore, which worked well. I can open the application now, and I can search for terms in it. However, when I highlight a term in, eg. Microsoft Office Word, and I press CTRL+ALT+F8, the Widget does not pop-up. If I want to search for the highlighted term, I need to type it in the Widget window myself. Any suggestions? Thanks in advance!