I created themes in Tab Backgrounds, but I can't find them in the terminal settings. How do I apply these themes?

[devTech-zhang]

Tab Backgrounds

{
  "bg@duskhorizon": {
    "display:name": "Dusk Horizon",
    "bg": "linear-gradient(0deg, rgba(128,0,0,1) 0%, rgba(204,85,0,0.7) 20%, rgba(255,140,0,0.6) 45%, rgba(160,90,160,0.5) 65%, rgba(60,60,120,1) 100%), radial-gradient(circle at 30% 30%, rgba(255,255,255,0.1), transparent 60%), radial-gradient(circle at 70% 70%, rgba(255,255,255,0.05), transparent 70%)",
    "bg:opacity": 0.9,
    "bg:blendmode": "overlay"
  },
  "bg@rainbow": {
    "display:name": "Rainbow",
    "display:order": 2.1,
    "bg": "linear-gradient( 226.4deg,  rgba(255,26,1,1) 28.9%, rgba(254,155,1,1) 33%, rgba(255,241,0,1) 48.6%, rgba(34,218,1,1) 65.3%, rgba(0,141,254,1) 80.6%, rgba(113,63,254,1) 100.1% )",
    "bg:opacity": 0.3
  }
}

No Themes