Hi Julie,
Option #1:
Some elements can be hidden right a product configuration level.
In the
CONFIGURE GENERATOR area described here:
http://support.realtimedesigner.com/wiki/doku.php/rtd_manual_ch_08_product_setup#configure_generator
you can quickly disable shapes and texts.
For "my designs", that's a company level setting. Can be found in
SYSTEM OPTIONS => Company Setup => Allow Users To Save Designs?. You just need to set it to NO.
However, those settings might affect other products you have.
So, here's option #2.
If you need a cleaner designer, I might suggest creating a dedicated store for it instead, and hide everything you do not need via CSS directly. The process is described here:
http://support.realtimedesigner.com/wiki/doku.php/rtd_manual_ch_15_garment_screen_printers
In a nutshell, you'd create a new store, create and assign a new style for it, and do you changes via the DirectCSS code if that new style itself.
I only hope what I just wrote does not sound Chinese to you: in case let me know.
Thanks!