Thank you for your post.
This is expected behavior. If a privilege set allows a layout to be modifiable, then FileMaker Pro will allow that privilege set to enter Layout Mode. All layouts that are set to modifiable can be changed. All layouts that are set to View Only can be viewed, but no changes allowed. All layouts that are set to No Access cannot be accessed through Browse nor Layout mode.
If no layouts are set to Modifiable, then that privilege set cannot enter Layout Mode.
Let me know if you need additional clarification.
<<This is expected behavior. >> I would not expect it.
If all layouts are set to view only, then layout mode is inaccessible, globally.
If just one layout is set modifiable, then layout mode is ACCESSIBLE, globally.
That the other layouts are set view only is overridden.
The usage implication of view only is inconsistent.
Universal view only blocks layout mode
One view only allows universal layout mode; recognising that modifications can't be made to those that are still set view only.
View only means view only in browse mode, if all are view only, but view in browse or layout if any one or more are modifiable.
Non obvious conditionals are not strict enough behaviour it seems to me.
Even if the result is relatively harmless.
Thanks for your response.
Keep in mind that you can navigate across layouts in layout mode as you navigate across records in browse mode.
Then the security feature is not the ability to access to layout mode depending on layout you are at this time, but the ability to see or edit the items or not.