### 25.5 TUI Configuration Variables

Several configuration variables control the appearance of TUI windows.

`set tui border-kind` kind
  Select the border appearance for the source, assembly and register windows. The possible values are the following:
  `space`
    Use a space character to draw the border.
  `ascii`
    Use ascii characters ‘`+`’, ‘`-`’ and ‘`|`’ to draw the border.
  `acs`
    Use the Alternate Character Set to draw the border. The border is drawn using character line graphics if the terminal supports them.
`set tui border-mode` mode
`set tui active-border-mode` mode
  Select the display attributes for the borders of the inactive windows or the active window. The mode can be one of the following:
  `normal`
    Use normal attributes to display the border.
  `standout`
    Use standout mode.
  `reverse`
    Use reverse video mode.
  `half`
    Use half bright mode.
  `half-standout`
    Use half bright and standout mode.
  `bold`
    Use extra bright or bold mode.
  `bold-standout`
    Use extra bright or bold and standout mode.