I don't recommend that anyone other than a completely new user use the out-of-the-box template (which is where those layer names are) ... and then, only for learning.
Your template should be customized to make you efficient. What layers and settings, sheets, masters, pre-linked drawings work for one practice may not be the right ones for another.
As you continue to work in AC, your most recent project is probably (should be) your best in terms of software usage... and so it should then become the basis for your template for your next project. Etc. The layers and other settings you know and love will move forward with you.
Starting fresh each time with a basic template delivered with the product is a sure guarantee for lower productivity and some frustration.
As Laszlo suggested... open your most recent 17 project in 18 - or the 17 template - and let that become your template.
One of the forum moderators
AC 28 USA and earlier • macOS Sequoia 15.2, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB