The next basic MIB operation is unloading. To unload the MIB, select the node of the MIB tree and click the Unload MIB Module button or select File --> UnLoad MIB from the menu. Alternatively, you can press the Delete key.
Performing any of the above prompts you for a confirmation. The following image depicts the confirmation dialog box.
Selecting 'Yes' unloads the MIB module. If no module is selected in the MIB tree, all the loaded MIB modules are unloaded.
The Load All MIBs option in the menu bar would load all the previously loaded MIBs and Unload All MIBs would unload all the loaded MIBs in the MIB tree.