You have some options other than exiting and returning.

1) Live set - load the same performance with live set. This doesn't exit to something else, it will reload. This is probably not what you want.
2) You can press the [EDIT] button while in an edit screen. Say you are in the [PERFORMANCE] (aka home) screen. Press [EDIT] twice. The [EDIT] button will flash. This is a way to compare your current edits/modifications (including changed slider positions) to the stored/saved Performance. While the [EDIT] button is flashing - the stored settings before you changed them will be used.
3) You can use scenes. For instance, set scene 1 such that the mixer settings (which include volume/slider levels) has your default slider positions. You can move the sliders to any alternate positions then press the scene 1 button to return the sliders back to their original logical positions. I say logical because obviously the sliders do not physically move on their own. [SHIFT] + the scene button to change the scene settings, then [STORE] this performance with the new scene(s). Make sure your scene menu turns on the mixing categories. Any categories of scene information which is turned off will not be changed when you press the scene button. This allows for you to customize what information is changed or not changed for each scene button. Do not assume these are already intuitively set to capture/change the settings you want. Double check.
4) You can send the MSB/LSB/PC from an external device to recall the original Performance. This can be a "one button" operation as well and depends on your external devices and what they can do (hardware and/or software).

Hi all, a few simple questions concerning the sliders:
1- After you have modified the volume on a few parts in a PERF, then set the sliders back to zero, is there any quick way to reset the levels for all parts to what they are programmed for in that PERF, other than exiting the PERF, selecting another, then going back to the first PERF?
2- If "yes" to #1, then how is this done?

The correct answer is: Recall the SCENE that represents your ‘start condition’.

A SCENE is a term that comes from the Yamaha Digital Mixers (circa 1987). It is the equivalent of a Program Change for mixer settings. Over the years it has been expanded to include synth settings in addition to mixer settings. Back in ‘87 the TX816, 8 DX7s in a rack, connected by 8 cables to the DMP7 digital mixer... back then synths didn’t have Effects, EQ, or any routing sophistication, so Yamaha invented a way to have the mixer change settings whenever a Program Change was made on the synth.... enter the Scene change.

Now after 30+ years of evolution.... it’s all in the keyboard.

From the Main HOME screen
Touch “Scene”
On this screen you can select the SCENE 1-8... any changes you make here are automatically stored
Recommended: activate Scene 1, set the MEMORY ON for “MIXING”
The Volume setting here can be recalled at any time by simply pressing the SCENE [1] button.

Scene settings can be applied to all 16 Parts of the Performance and can be automated in DAWs, or manually recalled whenever you need to get back to “square one”!

‘Start condition’ is an important concept... because playing a Synthesizer means changing settings as you perform... in the Performance Name box a small blue flag will appear as soon as you have altered any parameter from its original stored value.