You can define the maximum number of entries returned from a search and the time (in seconds) allowed to perform the search. You can set these options in the connection preferences dialog which can be accessed via the entry popup menu | Connection Settings.
You can also set the maximum number of entries returned from a search from the toolbar.
To set the maximum results and the time allowed from the connection settings right click any entry on the left hand side (LDAP Explorer) and then select the connection settings menu.
This will open the connection settings dialog, select the connection options tab and set the values.
For SQL Search and File Export limits see: