Hi Omar,
Greetings from Syncfusion support.
We have validated your reported query in File Manager component. We have prepared a simple File Manager sample with basic html component rendered below it, similar to your scenario. But we are unable to reproduce the issue that has been demonstrated in your video. Please find the sample from the below link.
We suspect that the reported issue occur due to some styles overridden in your application. To replicate this issue in our end, we request you to share some additional details on the following.
1. Code snippets of Html component rendered in your sample.
2. CSS styles used in your sample.
3. If possible, reproduce the issue in our shared sample to assist you promptly.
Regards,
Indhumathy L