Upgrading from bootstrap 3 to 5 causes all sizing to be enlarged
When I upgraded from bootstrap 3 to 5, it resulted in an enlargement issue of all the elements in every page of my app. All the components in this image do not use bootstrap with the exception of the dropdown menu (three vertical dots).
Yes, change all the CSS and elements to match your new framework. There's no "easy fix" when upgrading, you just go through each element that doesn't look right and change it.