Collapse Button Not Working in mdg 7.0 sp2

Hi All,

I am working on SAP MDG 7.0 SP2, I have completed all the necessary configurations but the collapse button is not working on the UIBB.

I have unchecked the collapse check-box ,hence all the UIBB's are already collapsed, but I cannot un-collapse/ minimize them.

Nothing happens on clicking the collapse drop-down arrow. Please guide me on this.

PFA the screenshot for the same.

Has anybody faced a similar issue, if yes then how did you resolve it ?