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"If there is a directory or JAR file mounted in Filesystems because you need it on your classpath, but you do not plan to modify it, you can hide it. Right-click the filesystem's node, choose Customize, and set the Hidden property to False." Instead of False there are to be True.
...and in the dev version of the tip, you can say to just use the property sheet, no need for Customize.
Fixed in trunk. Changed the procedure to point the user to the Explorer and property sheet. Added sentence to reverse hiding (pointing to Filesystems Settings).
Resolved for 3.3.x or earlier, no new info since then -> closing.
Resolved for 3.4.x or earlier, no new info since then -> closing.