Tab-related options

Tabs appear right below toolbar icons; they give you quick access to currently opened windows.

First set of choices

Let DC++ draw tabs: Select this option to let DC++ draw tabs, which allows it to add more customization (such as a close button, different colors and fonts, etc). (default)
Use standard Windows tabs: Select this option to use standard Windows tabs - DC++ won't be able to customize them.
DC++ needs to be restarted for this setting to take effect.

Second and third sets of choices

Several modes are exposed here with various differences; select the one you prefer.
One particular difference is that in tab style mode, multiline tabs re-organize so that the selected tab is always at the bottom. That isn't the case in button style mode.
DC++ needs to be restarted for this setting to take effect.

Tab width

Use this slider to define the width occupied by each tab. Move to the left for a lower width, and to the right for a higher width.
When the title of a tab exceeds the available width, it will be cut accordingly and appended with "...".
DC++ needs to be restarted for this setting to take effect.

Preview

This fake tab control shows how the main tab control would display after a restart of DC++, were the settings defined above be validated.

Tab highlight on content change

Hub: When a chat message appears in a Hub window that's not focused, the tab will be highlighted if you have this option selected.
Private message: When a private message appears in a Private message window that's not focused, the tab will be highlighted if you have this option selected.
File List: When the content of a File List window that's not focused has changed, the tab will be highlighted if you have this option selected.
Search: When a search result is received in a Search window that's not focused, the tab will be highlighted if you have this option selected.
System log: When an entry is added to the System Log window while it is out of focus, the tab will be highlighted if you have this option selected.
Download Queue: This option controls whether or not the Download Queue's tab will highlight itself when a queue item changes state or finishes.
Finished Downloads: When a download completes, the Finished Downloads tab will be highlighted if this option is selected.
Finished Uploads: When an upload completes, the Finished Uploads tab will be highlighted if this option is selected.