What is the Dynamic.ooo plugin, and what does it do? I’ve never heard of it, and I don’t know anything about it, so please elaborate. How is it related to the searching? How are things different with it compared to the basic Elementor that should work fine with Relevanssi?
In general, there are lots of cases where page builder themes do searches in a way that is not compatible with Relevanssi. This may be one of those cases. If the plugin does some direct search querying, that may be a problem for Relevanssi.
Since it’s a premium plugin, I would also recommend contacting their support. It’s possible they’re doing something that isn’t compatible with Relevanssi, and it’s possible there need to be some changes in their plugin to make it work with Relevanssi. In that case, they’re the only ones that can help you out with this.
Also, with some luck, the plugin already has filter hooks built in that can help solve this problem. If the plugin does direct search queries and has a filter hook to adjust the query parameters or to change the query function, then it’s easy to make it work with Relevanssi. Again, this is something I can’t know, but their support should be able to answer.