There are a few things you can do to get the look and feel of the old file explorer back.
First, make file explorer open to This PC by default instead of Quick Access.
In Windows 10, open a new File Explorer window and click the View tab from the ribbon toolbar.
In the View tab, find and click on Options, listed by default on the far right side of the ribbon.
In the Folder Options window, find the drop-down box at the top labeled “Open File Explorer To”. Click the drop-down menu and select “This PC”.
Click Apply.
If you click the View tab, you can adjust other settings here. If you make further changes click Apply and then OK to close.