KLAS to KBVU - climb and maintain 11000?

Am I missing something ? - When I create a flight, I can not see a way of selecting my flight altitude.

I chose KLAS as departure, KBVU as my destination, and ATC told me to climb to 11000.

I’m in a Cessna 172 and it’s only 18 miles away!

FSX used to have a bit more choice when setting up an IFR route, and I would normally choose a considerably lower altitude.

Can anyone please confirm if it is still possible to do this?