It looks like there have been several weeks without activity on this thread and so it seems that the issue was likely something specific in the project related to custom styles or how stylesheets are referenced. Thus, I am going to mark this as "declined", because it does not seem to be a bug in the component. In case new information comes to light, feel free to add it and it can be reopened.
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Posted on:07 Jan 2022 13:09
What is the previous version that you upgraded from?
Are you sure the app is now using the CSS theme for version 2.30? There may be a browser caching issue or outdated CDN URL.
Our Grid SearchBox online demo works as expected. You can inspect HTML and CSS with the browser's DOM inspector. Probably you will notice some differences, which will point to the cause of the problem.