Help users get the most out of personalized navigation by upgrading our Classic apps to lightning apps.
If we don’t want our users to personalize the navigation bar for a specific app, disable personalization.
Step-1: From Setup in Lightning Experience, go to the App Manager.
Step-2: For the desired app, we have to click edit.
Step-3: Then, In that Specific app select App option in left of the page .
Step-4: select Disable end user personalization of navigation items in this app.
Step-5: click save
Now we can see the personalized navigation bar for the app.
For More Blogs : How to set Details page to be default view in Lightning
For Reference : Click here