Exported wireframe images includes lot of white space. How to fix it?

This issue usually occurs when the wireframe has extra components in the page that are not clearly visible to the user. For example an empty text component, or a rectangle component with no border ... 

Here is an example screenshot with that issue :

In the editor, if you do select all, you can find there is an empty component as shown below:

How to fix this issue?

1. Do a select all in the page

2. Navigate to that part of the page and by clicking try to select the invisible component

3. Delete or modify the invisible component from the page

4. Now save and export the wireframe again