I am using Kendo UI for ASP.NET Core along with Bootstrap 4 and running into an issue with the responsive layouts of the grid on mobile devices. Upon further investigation, it appears to be a bug as I can reproduce it on the Kendo demo site.
The problem: When using the Bootstrap-v4 theme from Kendo, on mobile views the grid pager does not responsively update for the limited width as it does with other themes.
To reproduce: (I'm using Chrome) Go to https://demos.telerik.com/aspnet-core/grid/index, ensure the "Default Theme" is selected, using developer tools, toggle the device toolbar. Notice on the mobile views that the grid pager is properly formed (image attached). Now, switch back to the desktop view, select the Bootstrap-v4 theme, and again use dev tools to switch to the mobile view. The pager has not updated to properly display in a responsive fashion for the mobile device width. (image attached)