Try clearing all tab control in the layout
Edit Layout ---> Layouts ---> Set Tab Order ---> Clear All
I have cleared the tab order, the issue is still occurring
I suppose that clicking on a row in the list activates a script that brings you to the form. Did you examine this script?
I assume here that you want to disable data entry or prevent certain users of your database from making record changes on your List Layout. If that's the case, then you would probably want to setup your database security: File -> Manage -> Security and on the Privilege Set tab create a new or edit an existing privilege set. From there you can create a Custom Layout Privilege that will make the records on your chosen layout to be either: modifiable, view only (read only), no access (not accessible).
How did you "disallow field entry"? (There's more than one way.)
What you describe in your initial post seems contradictory. If you used the Behavior settings in the inspector to disallow browse mode access, using quick find should not by itself result in the field becoming accessible as this is done while in Browse mode. If you were to enter find mode--this is then NOT a quick find, you could enter the field, but not to modify the data there, this allows you only to be able to specify search criteria in that field--and this is only possible if you did not block find mode access.
So I find you original post a bit puzzling...