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I just opened the Particles Generator for the first time and using the browse to view presets, not all the presets open and the browser preview window is blank, nothing showing.
What am I doing wrong?
Thank you merciful mentors!

If your background is white in the file some presets are not visible because they are white too.
Try having a black background and then look through the presets.

Kathy Engelhard wrote:I just opened the Particles Generator for the first time and using the browse to view presets, not all the presets open and the browser preview window is blank, nothing showing.
What am I doing wrong?

which ones have no preview, I mean staying blank ?

basically, you have to select the preset in the topbar menu,
then LMB-clic in the middle of the preview window,
eventually, regarding the particule color and its color mode, change your BG color.

Thank you both. It's the browse window that I/2 of the presets do not show in and unfortunately I don't see a way to change the BG of that window.
So, I just opened the invisible ones in my project window and view them there. I'm just surprised that no one has mentioned it before.

Kathy Engelhard wrote:... It's the browse window that I/2 of the presets do not show in ...

1/2 of the presets ? ... can you name them precisely, or at least give us one of them,

Kathy Engelhard wrote:... and unfortunately I don't see a way to change the BG of that window ...

change the BG of your Project (left-down in the layer window)