The following instruction shows you how to remove the browse button from insert link dialog.

Open Tag_A.ascx file and change the following code:

<button id="btnbrowse">[[Browse]]</button>

to:

<button id="btnbrowse" style="display:none">[[Browse]]</button>

Please open CuteEditorWeb\CuteSoft_Client\CuteEditor\Dialogs\tag.config. 

To turn off the general tab, remove this line:
<add pattern="*" tab="Common" text="[[Common]]" control="Tag_Common.ascx" />

To turn off the style builder tab, remove this line:
<add pattern="*" tab="Style" text="[[StyleBuilder]]" control="Tag_Style.ascx" />