Custom field edit page is different for single selection and multiple selection
If you select and edit multiple issues, the custom fields are arranged vertically.
On the other hand, if you select and edit one issue, the custom field is divided into left and right.
multiple editing(Before fix):
Applying this patch will cause the custom field to be split into left and right for multiple edits in Issue.
multiple editing(After fix):
The attached patch implements this feature.