Here is how to change Magento2 Products Grid View to List View Permanently.

1.Login to admin panel of magento2.

2.Goto “STORES” in left panel and then click “Configuration”

3.Click on “CATALOG” and in sub item click “Catalog”

4.Click “Storefront”

5.Select List Mode to “List (default) / Grid”

6.Click “Save Config”

7.If it is ask for clear cache the goto “SYSTEM” in Left panel and then Click “Cache Management”

8.”Select All Cache Type” –> Select “Refresh” –> Click “Submit”

Thats All