• Currently, I used JIRA version v6.0.3#6099-sha1:c205478
• When I want to add Link on issue, I can not added it, because the popup Add Link is very big, the action Link is hidden under bottom of browser. So, I can not click it for submit form Link.

Detail Step:
+ Open the JIRA site and add one issue.
+ After jira create, open this jira.
+ Click to action More on menu-bar and Click to action Link on menu-item. The popup Link display.
Bug:
+ The popup is very big can not see all actions on bottom of this popup.
Expectation:
+ Can support resize if popup is big and alway set position of popup is center of browser.
+ For all case, the action on bottom of this popup always displayed.

Workaround
Use full screen
Open the link dialog in a new browser tab