Set Theme in window creating local Window = WindUI:CreateWindow({ --... , Theme = "Dark" -- enter your chosen theme name }) or with function WindUI:SetTheme("Dark") Create Own Theme You can create theme with WindUI:AddTheme() MinimalisticAdvancedWindUI:AddTheme({ Name = "Dark", -- theme name Accent = Color3.fromHex("#18181b"), Background = Color3.fromHex("#101010"), Outline = Color3.fromHex("#FFFFFF"), Text = Color3.fromHex("#FFFFFF"), Placeholder = Color3.fromHex("#7a7a7a"), Button = Color3.fromHex("#52525b"), Icon = Color3.fromHex("#a1a1aa"), }) All ThemesLoadstringLoad WindUI using loadstringWindowConfigure and create windows in WindUI