If all you did was remove the printer by selecting the "-" icon in System Preferences->Printers & Scanners just select the "+" icon to reinstall.
You can also download the software here: Support | MG Series - Inkjet | PIXMA MG7520 | Canon USA.
1. did the printer work on your M1 computer before it got deleted?
2. If so, did you migrate your Mac setup from a previous computer to the M1 device?
3. If so, download the printer driver for the previous OS and install it.
4. If 1 & 2 are not "yes" then just try adding the printer in Monterey and see if Apple has a built-in driver. It does for many printers.
Sorry for the long delay in answering again. I'm having several health issues all happening at once. So I tried #4 and got an answer that Apple doesn't have a driver for this printer. And I need to contact Canon for correct Driver. I can't seem to talk to a live person, and Chat doesn't seem to understand my simple questions. I have a brand new computer and OS (Apple Monterey OS w/M1 chip) and the printer (Canon Pixma MG 7520) is probably 7-8 years old. Has been working fine, until I changed computers. The problem for me (I think) is finding the right Driver for the printer.
OH, NOOOOOOO. Not something I wanted to hear. I'll try contacting Apple support again next week and see if they can recommend a work around, or at least direct me to a new compatible printer. And I've got all these new ink jet cartridges that are now also obsolete. This is soooooooo frustrating.