When you encounter the message "Current selected layer is hidden," it means that the layer you are trying to work on or access is currently not visible. This can happen if the layer visibility is turned off or if the layer opacity is set to 0%.
To resolve this issue and make the layer visible, you can do the following:
1. Go to the Layers Panel and ensure that the layer you want to work on is selected.
2. Check the visibility toggle button (eyeball icon) next to the layer. If it is turned off, click on it to turn it on.
3. Adjust the opacity of the layer if needed by moving the opacity slider. Ensure that the opacity is set to a value greater than 0% to make the layer visible.
By following these steps, you should be able to make the selected layer visible and continue working on it in Procreate.