Thank you, Sami, for trying. I’m just going to find and install another theme.
I removed the widgets and added them back. I also removed the themes and installed them back. But the sidebar still doesn’t work.
I noticed now that the Front Page sidebar is being displayed in the subsidiary area (and the Subsidiary widget as it should be). I labeled the widgets like this:

Thank you for taking time, Sami. Yes, I have widgets in the Primary sidebar and also in the Front Page sidebar (I made a screen shot below). I also tried to change the page template to Default, Child, Front, No sidebar … Nothing works 🙁
