Why a Page is Locked from Personalization
There are two conditions that prevent you from personalizing a page. Either the page is locked (as indicated by the 
) icon or it's blocked (as indicated by the 
icon).
Locked from Personalizing
If there's a icon in the Personalizing banner when you open a page, you're currently prevented from making any more personalization changes to the page.
There can be two reasons:
You've personalized the page before, but it was done using an earlier version of the product. We changed the way personalization works behind the scenes since the last time that you personalized the page. Unfortunately, the old way and new way of doing things don't work together.
Until now, you've only used the bow deprecated Dynamics NAV Client connected to Business Central to personalize the page.
Unlocking the Page
If you want to unlock a page and continue personalizing it, choose the icon, and then choose the Unlock action.
Caution
The current personalization of the page will be cleared. The page will go back to its original layout, and you'll have to start from scratch.
Blocked from Personalizing
If there's a icon in the Personalizing banner, you're blocked from doing any personalization to the page.
The reason is that the Role Center or role that is currently associated with your user account modifies this page specifically for your role. Contact your administrator for assistance. Alternatively, try switching to a Role Center that does include role-tailoring for this page. For more information, see Change Basic Settings.
See also
Personalize Your Workspace
Customize Pages for Profiles
Change Basic Settings
Change Which Features are Displayed