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Select the ball next to a layer name in the layers panel. Look in the appearance panel. Has the layer opacity changed?
That was it !!!!! Thank You so much !!!!!
show please the screen with its top part (with top menu). There might be some useful details.
it looks like you're in Isolation mode inside the text object next to yor color palette (the black text placeholder). If so, try to make a double-click LMB on any empty place.