Changing the 'Set maximum features returned' value for a web feature service (WFS) disrupts the display of the layer and produces an error when viewing the attributes table.
Add the MAXFEATURES parameter using the Properties page for the WFS connection > 'Custom request parameters' and set it to the intended value for the WFS Layer > Properties > WFS > 'Set the maximum features returned'. The caveat of this workaround is once set, changing the MAXFEATURES for the WFS service again, say from 10,000 to 20,000, only take effect if the current layer is removed from the Contents pane, and added again from the Catalog pane. Refer the attached video BUG-.000172516_Workaround_StephanBeijer.mp4.