Column resize is not working as expected when there are icons present in the column header. Try to resize in the below demo: https://www.htmlelements.com/angular/demos/grid/column-menu/
I am able to resize if I move the cursor to a very specific location in the header though only if I move the cursor to a very specific location, but it is a very difficult experience to move the cursor to that point for resizing.
Yes this definitely is not user friendly behavior and I have added work item for this case as well and we will work on to fixing it as soon as we can.
Thank you for your corporation!
Please, do not hesitate to contact us if you have any additional questions.
Smart UI Team https://www.htmlelements.com/