SharePoint 2019 functionalities are not guaranteed to work reliably in Internet Explorer version 10 downwards.
SharePoint 2019 uses modern technologies, that are unavailable in Internet Explorer. Internet Explorer browsers do not receive feature, security and performance updates the way other Modern browsers do.
It is recommended that you as much as possible view and interact with your SharePoint Server 2019 sites on Modern browsers like Microsoft Edge, Google Chrome, Mozilla Firefox.
Browser support levels in SharePoint Server 2019
The following table summarizes the support levels of typically used web browsers.
|Internet Explorer 11
|Internet Explorer 10
|Internet Explorer 9
|Internet Explorer 8
|Internet Explorer 7
|Internet Explorer 6
|Google Chrome (latest released version)
|Mozilla Firefox (latest released version plus immediate previous version)
|Apple Safari (latest released version)