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Since: Version 20210404-112810-b63a949d

The functionality described in this section requires version 20210404-112810-b63a949d of wezterm, or a more recent version.

Activate the previously active tab. If there is none, it will do nothing.

config.leader = { key = 'a', mods = 'CTRL' }
config.keys = {
  -- CTRL-a, followed by CTRL-o will switch back to the last active tab
    key = 'o',
    mods = 'LEADER|CTRL',
    action = wezterm.action.ActivateLastTab,

See ActivateTab for a way to activate a tab based on its position/index.