Hi, the following steps to reproduce the problem:

• Run the code snippet taken from kendo angular demo column menu, edited only for reproduce the problem: https://stackblitz.com/edit/angular-ugdmvg?file=app/app.component.ts
• Perform a vertical scroll of the grid (according to the display resolution maybe is necessary resize the window).

As you can see, the three dots menu of the not ticky columns are not hidden when overlapped by sticky columns.

Best regards,

Alessandro