Re-edit gradient tool in photoshop

If I draw a gradient tool on a layer, it is re-editable until I do something else with some other tool. But if I click off it, and come back to it, I can’t then re-edit the gradient because the on-screen indicator doesn’t come back.

If I re-click the layer mask, and use the gradient tool again, it doesn’t have the gradient tool’s indicator (the bar with two circles at either end)  on the screen, and thus if I click anywhere on the screen, it replaces it with a new one rather than letting me re-edit the existing one.

It should show the bar with two circles at either end indicating the gradient when I click on the layer mask that has the gradient fill.

I seem to vaguely recall there is a ‘reset tool’ option that brings it back but I can’t find it now.

Can anyone help please? If you don’t know what I mean let me know and I’ll elaborate with a video but am hoping that describes it.