Deleting Files in InDesign

I successfully did what Manan Joshi suggested by following the instructions in the link to rockymountaintraining, with ctl/opt/shift/cmd. So I deleted InDesign preferences, apparantly, but I'm not sure. Well, now when I open up InDesign, after selecting File/New/Document, it gives me a completely black screen which is blank and no options show up.

to start, again, from scratch, I tried this: I deleted InDesign using Apple Finder (moved the InDesign folder to trash)  (as I already saved all my documents to the cloud on Apple), then shut down the computer and restarted. Then I installed InDesign from my Adobe.com account. Same thing showed up. A big blank black box with the InDesign menu bar accross the top, but none of the menu items react. There are none of the usual tools showing. What's going on now? I'll wait a bit to see if anyone responds. I just did what the Correct answer for Mana Josi said to do. I'm on a new Apple OS (10.15.7) with the newest version of InDesign as of  Nov. 2020. I guess I can call Apple, as they offer a direct help line with real people on the phone. Maybe Apple's staff can help find how a newly installed InDesign does not react. I'll never try to delete an InDesign file again, or mask it, or whatever, as I've already lost too many hours already on this. I was just trying to delete the 11 tutuorial files that were taking up all that space in my files and I have that's ready to publish, so I need to get going again. Unless anyone has a less risky way to get rid of an InDesign file, I'll just get used the idea of ending up with endless files as the years go by that I don't need in InDesign. Do you InDesign users really have all your files from the last years to wade through each time you look for something? Or do you save the files you may need, (like my published book and book cover, and epub that I must save),  to a cloud or external drive e for safekeeping, then delete and reinstall a InDesign? That's what I'm trying now, but the ctl/shift/etc. thing I did that Manan Joshi recommended really messed up my InDesign. So after I get this InDesign working again, I'll save fewer drafts and I sure won't waste anymore space downloading tutorial files that I'll also have until my dying day. I can't wait to include my InDesign files in my will, to be passed along to spouse since I can't get rid of them and keep using InDesign. It looks to be a decent, useful program for book publishing and I see no alternative but to use it, as it has the best options for a professional looking printed book and epub, but this file nonsense seems to be a serious flaw. Really, it looks like there's no other way to work on InDesign safely, but to put up with the fact that Adobe is too stubborn to put in a "Delete File" option for InDesign.  As if we're too childish as users to be trusted to delete an old file we don't need? Am I missing something easy here? Is there a safe way to delete an InDesign file? All I've managed to do use up a lot of time and now my InDesign won't work at all. This is just too much fun.  I've gotten used to the InDesign tools and created some great book covers, including one that that's on a top seller for its genre on Amazon and the other outlets, so Adobe's graphic's professionalism is fine, but would another Adobe product be acceptable for print books and epubs other than InDesign, and also allow me to delete a file? I need the standard TOC, sections, chapters, index, endnotes and footnotes, which is why I am using InDesign now, as it has all those, plus all the nice formatting for photos, charts, etc.

These files have been deleted, that's why you can't access them (don't forget to empty your trash can). What's the issue?

Please confirm your InDesign version and OS.