Zabbix 4.0.4 - create item, key, select screen issue

[stevenfoo]

Hi,

I tried to create a new item for my host, however when I click on the select button, I get a whole screen and the layout is out.

Please see my screen capture.

[stevenfoo]

I think the issue is the theme.. I revert and choose back System Default.. the screen seem to be back now. I am not sure why. Just a hint for those who have issue with it.