Pink-Black Ren'py GUI

You can define a variable then put everything in the side menu screen under an if statement. So

default side_menu_vis = True
screen side_menu():
    if side_menu_vis:
        add "gui/qm/side_bg.png" xalign 1.0 at side_float
        add "gui/qm/menu_bg.png" xalign 1.0 offset (-50, 50) at side_float
        vbox:
            at side_float
            style_prefix "side"
            textbutton "Quick Save" action QuickSave()
            textbutton "Quick Load" action QuickLoad()
            textbutton "Save" action ShowMenu("save")
            textbutton "Options" action ShowMenu("preferences")
            textbutton "History" action ShowMenu("history")
            textbutton "Main Menu" action MainMenu(confirm=True)

Then you can control the accessibility of the side menu by turning the variable (side_menu_vis in this case) True or False.

The regular quick menu (back,auto,skip) already has a variable for this, it's quick_menu

Hi!

So, method one would be creating a unique locked image for the images. Just drop the original locked image in an image editor, edit it how you see fit, save it under a different name and then for the gallery button you can add

add g.make_button('cg_1','cg_1_thumb', locked = "gui/gallery/alternate_bg.png")

(the "locked = " part is the addition)

The second method is adding the text with code. Simply switch the gallery button to

button:
        xysize(447,259) ## defining the size of the gallery button
        add g.make_button('cg_2','cg_2_thumb') 
        label "This is a tip" align(0.5, 1.0) yoffset -35 text_color u"#ffffff" at slot_hover
        action NullAction() ###leave it nullaction, it's here so the hovering transform is registered

It makes it so when the button is hovered, a text tip appears. You can style it however you want to (to make it less tedious, look into style prefixes in the documentation🙏) If you want the text to be always there, not just when hovered, just remove the "at slot_hover" and "action NullAction()" lines.