Problem Setting Grid Lines in 1.7

I updated a development version of my site to 1.7 to test the updates. My only issue is that the Grid Lines in the Line Graphs for both the Vertical and Horizontal Axis cannot be set. The field has become a hyper link that takes me to https://userguide.icu-project.org/formatparse/datetime#TOC-Date-Time-Format-Syntax but I cannot set the actual grid lines for new or existing graphs.

I won’t be able to update the plugin until this is resolved. Please confirm and address the issue.

Thanks
Juan