When selecting an image to view the top half is covered by the header image. Follow the next steps in order to fix this problem:
1) Go to the plugin settings page and open "Custom Code" tab;
2) Mark "Activate custom CSS code" checkbox in "CSS" section and insert the following code:
#branding {z-index: 1000 !important;}
3) Save changes.
This article related to Galley by BestWebSoft plugin
Additional resources: Gallery - User Guide
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