Sometimes you may need to make this screen less cluttered removing repeating values in the Make column. Something like this:
Here is how this can be done.
1. Add the following code to List page: BeforeProcess event:
2. Set 'View as' type of Make field to 'Custom' and paste the following code there:
if value=SESSION("make") then value="" else SESSION("make")=value end if
This is it.