I have to switch to Niagara launcher occassionally

The system switches to default phone launcher sometimes when I unlock the device and sometimes when I exit an application. Then I have to open the launcher from my home screen icon where I'll be asked to switch to Niagara launcher. But the default launcher will already be set as Niagara. I have tried uninstalling recent updates of Digital wellbeing and revoked all it's permissions, moreover I have allowed all accessibility options for Niagara. Please find me a solution for this