wezterm/docs/config/lua/keyassignment/ActivateTabRelative.md

ActivateTabRelative

Activate a tab relative to the current tab. The argument value specifies an offset. eg: -1 activates the tab to the left of the current tab, while 1 activates the tab to the right.

local wezterm = require 'wezterm'
local act = wezterm.action

return {
  keys = {
    { key = '{', mods = 'ALT', action = act.ActivateTabRelative(-1) },
    { key = '}', mods = 'ALT', action = act.ActivateTabRelative(1) },
  },
}

See also ActivateTabRelativeNoWrap