Yeah you are trying to apply a months only filter. Looks good to me
above screen shot in the bottom does not appear "ok" button.that's the issue.please help me how to solve this
Check that you have not added a new filter to the line items tab.
If so, this is incorrect. Click on the minus sign, " - " to delete it.
You should then be able to proceed.
Kindly change the 'Zoom' settings from the three dots at the top right corner of your chrome browser. Zoom out to 80% or less if required. You should definitely be able to see the buttons.
Seems to be an Anaplan Bug. I have been experiencing the same.
Double check if there are any other filters which are incomplete/incorrectly set up in the other tabs.
If not, try scrolling down when your mouse is in that box, the "Okay" box can sometimes be hidden below if the box is too small for whatever reason.
Hope this helps!