redirect wp-admin page

I have activated the custom url feature. when I go to wp-admin now, it shows the 404 page. How do I make it redirect to the homepage instead?

The 404 page shown is different to my default 404 for some reason. It isn’t pulling in some images and is showing an incomplete page.

https://www.ads-software.com/plugins/all-in-one-wp-security-and-firewall/