Downloaded app has caused problems

I have downloaded and installed a QR Code reader, but not only does it not work, but I cannot uninstall it (either by holding on the icon and clicking on uninstall, or by going into settings>apps, then clicking on the app to try to remove it). Both times it takes me back to my Home Screen.
I have also found that I cannot open Accessibility in the Settings, takes me back to the Home Screen again.
And also now, when I hold the power button in to either restart or turn off the phone, this doesn’t work either…it just switches the screen display off.
I have tried force restarting the phone, but this has had no effect either.
Can someone please offer any help?
Many thanks.

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