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Items that are not in the inventory are marked in a different color. For me the contrast is not enough.
Is there any way to change the background color or change the brightness?

It's probably one of the disabled_recipe_slot_tint or disabled_recipe_slot_background_tint utility constants.

these constants affect the color of the right panel

flame_Sla wrote: Thu Mar 12, 2026 3:33 pm Items that are not in the inventory are marked in a different color.
background color in the GUI.jpg
For me the contrast is not enough.
Is there any way to change the background color or change the brightness?

It part of the GUI style. You can see the name of the style by activating the gui inspect tool (Ctrl+F6) and hovering over the element, it'd be the topmost bold name on the right panel. You can then modify that style in data stage

using the style I was able to add a frame around the slot I couldn’t change the background color, it looks like the color is set somewhere else

this solves my problem, thanks everyone for your help