We can Customize/Personalize NAV2013 RTC in different ways.
some of them are "Choose Column" and "Customize This Page" etc
We can stop/disable these Custimizations/Personalizations using a setup in NAV2013 RTC
Go to Profiles page
CRONUS Nederland BV/Departments/Administration/Application Setup/RoleTailored Client/Profiles
Select Profile for which you want to disable personalization
Set TRUE in "Disable Personalization Field".
Close RTC and Reopen
Now the above options are not available