You may not be aware you can change symbols and timeframes with just the keyboard in NinjaTrader. You have to learn the shortcuts for each timeframe, but once you know them, you can quickly choose between timeframes without having to use the interval menu - or even the instrument menu.
To change to a 2-minute chart, just type 2m and hit the enter key. To switch to a 5-minute chart, type in 5m and hit Enter. 30m would bring up the 30-minute chart. 500t brings up a 500-tick chart.
To change instruments, type AAPL and hit Enter to change to Apple, or CL 09-22 then Enter to switch to CL futures.
You can also combine the two. For example, MSFT 5m brings up the 5-minute Microsoft chart.
You can learn more details about how this is done via this NT help guide link:
Click on the section labeled How to change a Data Series, and scroll to the bottom of that section to see the keyboard controls section.