There's actually an easy fix for this. Some PowerShell command that reinstalls cortana and all windows store apps. Then killing cortana in task manager and you can search again.
https://www.repairwin.com/fix-start-menu-cortana-not-working-issues-windows-10/
Go to method 3, may as well reboot after
https://www.repairwin.com/fix-start-menu-cortana-not-working-issues-windows-10/
Go to method 3, may as well reboot after