With the next major release of Gramps (5.2) there will be greater control by the user in how place names are displayed.
But there are some some things you can do today.
If you have “West Coast” between “California” and “USA” you can do away with that as a hierarchy level. California should be directly below USA. You may need a “West Coast” under USA to account for that relative that went “West” and the actual location or state is unknown. All you know is that they went to the West Coast.
In the Display Place Editor found in the Preferences Display tab you can create different display options. Remember, any setting will apply to all displayed place names.
One option is to create a Format “City”. In the Levels field put p0 This will display just the populated place name. (City/Town/Village/Hamlet). p0,-2 would display the City, State for places in the U.S. where the hierarchy is Country, State, County, City. These settings are convenient for graphs where place names can get very long and will skew box sizes.
This is also where you set which order to display “Number Street” or “Street Number”. Right now these are applied universally but as I mentioned, the next major release will allow this setting by country.
This is also where you set which order of places are set. Smallest to Largest or the reverse display order Largest to Smallest.
Hope this helps.