How to Edit WordPress Gallery Spacing

1. Log in to WordPress.
2. Go to 'Posts' and select the post where your gallery is located.

3. Switch to the 'HTML' tab.
4. Edit the gallery shortcode to include the thumbnail size and number of columns:[gallery link='file' columns='2' size='thumbnail']
5. Adjust the number of columns and thumbnail size to control the gallery spacing. If you wish to space the images closer, you can change the thumbnail to a bigger size or adjust the number of columns. For example:[gallery link='file' columns='3' size='medium']
6. Save your post.