@Juraj, but is it possible to know which user is logging in at that moment?
An alternative is placing an macro in URL redirection of the navigation property on your logon page.
You can do this for example based on the role of the user with this macro:
{% CurrentUser.IsInRole("{roles}") ? "/DocLibrary/RBC.aspx" : "" |(user)zbynekh|(hash)34483e305580886b460a96fa317c8fae9c2d8455fbb128fe5a054a22ca0c7fd5%}
Or you can also do it on an specific user like this :
{% CurrentUser.UserName == "{username}" ? "/DocLibrary/RBC.aspx" : "" |(user)zbynekh|(hash)a515720cfeaa21af2e7d1e72cb22150d2e808e01a94758ee254e779adc7cfb1b%}
Offcourse you can also use other properties like UserID, FullName, etc.
If this answer helped you, please vote for my answer :-)