It sounds like you are referring to the way that the icons are displayed in the navigation pane in File Explorer on your two Windows 10 systems. Here are the steps to change the way that icons are displayed:
Open File Explorer on both of your Windows 10 systems.
Click on the "View" tab in the top menu bar.
In the "Layout" section of the menu, click on "Navigation pane."
In the "Navigation pane" section of the menu, you should see options for "Expand to open folder" and "Show all folders." Make sure that both options are selected.
Under "Navigation pane," click on "Options."
In the "Folder Options" window that appears, click on the "View" tab.
Under "Advanced settings," scroll down until you see "Always show icons, never thumbnails." Make sure that this option is selected.
Click "Apply" and then "OK" to save your changes.
These steps should ensure that icons are always displayed in the navigation pane instead of the folder with the small icon. If you are still experiencing issues, you may want to compare the settings under "Folder Options" on both of your Windows 10 systems to see if there are any differences that could be causing the issue.