Add… - Opens a small dialog to enter space separated Unicode codes. Found symbols will be appended to the end of current tab.

Delete… - Opens a small dialog to enter space separated Unicode of symbols you want to remove from current tab. Or click Select button to pick symbols to remove.

Reorder - Drag cell to reorder it. click Done button to accept the change. Note: In this mode, all other operations are disabled.

Reset to Factory Default - Reset the current tab to default symbols shipped with product.

Append from Factory Default - If you have deleted some symbols shipped with product, select this will bring them back to original location, while still keep those you added at the end.