The easiest and most effective method for ‘keying’ (removing) any plain color (green, blue, or any other color) background in Photoshop (as long as the subject has none of that color in his/her clothing or makeup!) is to use the ‘Color Range…’ command, located in the ‘Select’ menu.
How do I change the color of a layer in Photoshop 2020?
Click the Create New Fill or Adjustment Layer button in the Layers panel, and select Solid Color. This adds a Color fill layer inside the layer group. The mask on the layer group limits the solid color to the object. Select the new color that you want to apply to the object and click OK.