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As I understand your HP Envy 4520 printer is stuck on printing alignment page. Don't worry as I have a few steps to help you get through this concern,
Let's start off by performing a Hard reset on the printer and make sure that the printer is connected directly to the wall outlet and not to the surge protector.
Remove all the ink cartridges and then try to perform a hard reset on the printer.
With the printer turned on, disconnect the power cord from the rear of the printer and also unplug the power cord from the wall outlet.
Remove USB cable, if present.
Wait for 2-3 minutes, press and hold the power button on your printer for about 30 seconds to remove any additional charge.
Now plug back the power cable straight to a wall outlet without any surge protector or an extension cord and then plug back the power cord to the printer.
Turn on the printer and wait till warm-up period finishes and the printer is idle.
Now insert the ink cartridges and then try to print a test page and check if it works.
Use these tips to help complete the alignment or remove the message.
Use clean white paper: Make sure the printer is loaded with unused, clean white paper, and then retry alignment.
Scan page if required: If your printer has a scanner, you might see instructions on the alignment page to place the page on the scanner bed and press Scan. Follow the instructions on the alignment page to complete the scan.
Choose 'Skip' to continue printing: If the 'Alignment Unsuccessful' message cannot be resolved, and you see a Skip button, you can choose to continue printing without alignment. Print quality might be affected.