Make sure you have a .wezterm.lua Config file ready in your home directory and it's correctly loaded by WezTerm. Refer to the Configuration Docs.

The Config

The configuration as a constant opacity variable which is just there for consistency. An initial background opacity will be set when the configuration is read the first time.

We then listen to the window-focus-changed event to - get any previous and - set a new config override.

This is inteded to run on macOS, apparently you can build a similar effect on Windows.

local wezterm = require 'wezterm'

local config = wezterm.config_builder()
local opacity = 0.9
  
wezterm.on('window-focus-changed', function(window, pane)
    local overrides = window:get_config_overrides() or {}

    if window:is_focused() then
        overrides.window_background_opacity = 1
    else
        overrides.window_background_opacity = opacity
    end

    window:set_config_overrides(overrides)
end)
  
config.window_background_opacity = opacity
config.macos_window_background_blur = 30
  
return config

Sources

• https://wezfurlong.org/wezterm/config/lua/wezterm/on.html

• https://wezfurlong.org/wezterm/config/lua/window-events/window-resized.html

• https://wezfurlong.org/wezterm/config/lua/config/macos_window_background_blur.html

• https://wezfurlong.org/wezterm/config/lua/window/index.html

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