jitsi_app_c0/react/features/participants-pane/theme.json

{
  "contextFontSize": 14,
  "contextFontWeight": 400,
  "headerSize": 60,
  "panePadding": 16,
  "participantActionButtonHeight": 32,
  "participantItemHeight": 48,
  "participantsPaneWidth": 315,
  "rangeInputThumbSize": 14
}