`MoveTabRelative`

Move the current tab relative to its peers. The argument specifies an offset. eg: -1 moves the tab to the left of the current tab, while 1 moves the tab to the right.

lua

local act = wezterm.action

config.keys = {
  { key = '{', mods = 'SHIFT|ALT', action = act.MoveTabRelative(-1) },
  { key = '}', mods = 'SHIFT|ALT', action = act.MoveTabRelative(1) },
}