After auto hiding the Launcher, you can reveal it by moving the mouse
cursor to the left edge of the screen. But when you feel that you have
to actually knock the mouse cursor against the screen edge hard enough
to get the Launcher revealed, then it's better that you adjust the
'mouse pressure' using CompizConfig Settings Manager.
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Install CompizConfig Settings Manager from the Ubuntu Apps Directory if the application is not available in your system.
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Press Alt-F2 and type ccsm into the box, press Enter to run this program. (You may receive a warning to use this advanced tool with care.)
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Select "Desktop" from the left panel.
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Click "Ubuntu Unity Plugin".
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Under the "Experimental" tab, change the value of "Launcher Reveal
Pressure" from the default 20 to a lower figure such as 5, click "Back"
and "Close".
Try the Launcher again and enjoy.
