Normally, I only want to see keyframes for the layers I'm actively editing. When I need to see the keyframes for two or more layers at once, I select them and enable Timeline Visibility for them. Timeline Visibility keeps the enabled layers visible even when they are not selected.
Use the Search box to show all the Switch layers in a project at once. Kind and Tags are a good way to reveal all the Switch layers. Sometimes, I use a code in the layer's name. When the Switch layers are revealed, enable Timeline Visibility for them.
I have my own method for quickly selecting Switch layers and loading them into the Switch Selection window. I'll post the script with instructions for using it in the near future.
I
think you can use the Layer Comps window to create a preset for Timeline Visibility groups, but I've never gotten that to work. Or...it could be that I've misunderstood what the TV options in the Layer Comps window are for. (I should look this up.)
If you REALLY want all the layers to be visible all the time, I suppose you can enable Timeline Visibility for everything. But, TBH, that's a chaotic way to work in Moho. To me, the less data I see at one time works better and faster for me. This is the big reason I completely disable Color Bones in Timeline Channels...all that data in the timeline is completely unnecessary most of the time (or ALL of the time for me.)
Hope this helps.