A basic question regarding grub display options

[PM]

hi,

When I boot my PC (dual booted with windows), an option to choose comes from
where I need to select the OS. I installed, Start-Up Manager, and now I can
set the options graphically for that. But how can I hide the choice in the
list of OS.

Two extra choices come - 1) For memory test (I don't know why this comes)
and 2) Ubuntu Recovery Mode. I guess there would not be any problem if I
need to hide these two options (since they are not used, more clearly I
never used). So how these two options can be hidden in that display which is
not possible from Start-Up Manager.

Thx.
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