Hello Neli, thank you for your reply.
I checked the dev console in both Chrome and Firefox and I do not see any errors that show up. The only error I see is when I use Fiddler. I receive a 404 error on this file /ReportViewer/js/kendo.custom.min.js.map. I should mention that I'm using the template and the dll's straight from the installer with no modifications.
I've done a little tweaking and I got the report to render correctly...it's just missing the parameters area. The parameters area defaults as hidden when the report loads.Even if I set .ParametersAreaVisible(true) it pretty much ignores it.
I changed to using the default template and the report is sized to the initial_load picture above. Using the Font Awesome template it renders correctly but the parameters area is hidden. I checked my site.less file for the styles and the height of the report viewer is set to 700px but it's completely ignoring it for some reason. Maybe it has something to do with that style file?
Also, previously in the 2016 release there was a kendo.subset.2015.3.390.min.js file but moving to 2019 that subset file doesn't exist. Instead I read that I have to replace it with a file like kendo.all.min.js; stated here https://docs.telerik.com/reporting/html5-report-viewer-system-requirements#important-settings. However I'm not sure where that file exists.
I used the upgrade wizard at the beginning and had a many more problems because I didn't realize it didn't update the references (this is a web MVC project). I updated the dll's to the correct ones and all of the references but the reports still do not load correctly. I used the instructions listed here https://docs.telerik.com/reporting/telerik-reporting-rest-host-http-service-using-web-hosting#manually-configuring-telerik-reporting-rest-service-on-iis.
This is very similar to my issue when I use the default template but I'm not sure where this person updated the information.
I believe that's all of the updated information I've found. The only thing I can assume is it's a style issue but I'm not sure where.