Open the Paragraph Styles panel, and choose New Paragraph Style from the panel menu. At the bottom of the dialog (General panel), uncheck Add to CC Library. You should also do the same for the Character Styles panel > New Character Style and Swatches panel > New Color Swatch.
That choice is sticky and shouldn't show up again unless you restore your InDesign preferences.
Thanks very much Steve. That's just the ticket. Although, for colour swatches, the option to add a swatch to CC libraries only seems to be available through the drop down list in the top corner of the colour menu. The add to CC libraries option isn't available for other methods of adding swatches.