HP L1755 User Manual page 22

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You can change your monitor's viewing position to portrait. To
rotate your display to the portrait position, you will need to install
the Pivot software, which is contained on the CD included with
your monitor.
Pivoting the Monitor
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CAUTION: Burn-in image damage may occur on monitors that
display the same static image on screen for a prolonged period of
time. To avoid burn-in image damage on your monitor screen, you
should always activate a screen saver application or turn off the
monitor when it is not in use for a prolonged period of time.
User Guide
Setting Up the Monitor
3–13