I'm having trouble with Elementor and Toolset working together. I know you've heard this all before. I've seen similar issues to the one I'm having in your support forums, but I'm pretty certain the resolutions that were provided there aren't what's happening to me although the symptoms appear the same.
I've set up a dummy site using your Gyms and Trainers demo with the latest Elementor Pro installed. I've set up a single post template using the Elementor theme builder for a faux model database. I've added the post types and taxonomies and I've made sure none of the post types have any content templates assigned, which seemed to be one of the main causes for a lot of Elementor issues I saw in the forum.
I've got a very simple Toolset View that I've created within the standard WordPress editor, called Simple Model List, showing four model profiles that I'm trying to embed into my single post template so that more models will show up in a "You May Also Like", row of options. However, I'm not able to see anything in the preview page once I add the view to the page using the Toolset View Elementor widget.
In the site I was working on prior to setting up this demo, I could add the view, but it would show up in one column instead of 4 inside the Elementor template, distorting, of course, the image as it stretched it out across the page or it would break the page with coding errors OR it wouldn't show up at all. I tried working with both Toolset Views (legacy) and Toolset Blocks, for days, before basically giving up and reaching out to support.
I've referenced the article https://toolset.com/2018/07/toolset-elementor-integration/ and several You Tube videos from the legacy hidden link to all the training videos on your website. I can't find anything specific to Elementor and the Toolset Blocks widget though. The legacy video is several years old and requires creating the views manually with shortcodes. My version of WordPress isn't lining up with the video and I can't find the shortcodes she's inserting in the shortcode widget, but I tried it that way, with some success. However, it's much more difficult to edit the look of the output - and of course, I don't want to do it the old way if since the documentation says to use Toolset Blocks with the Elementor Blocks for Guttenberg plug-in installed.
SO, I've done my research and I still can't figure this out. Pulling my hair out, now. I'm missing something. Please help.