How do you put paranthasis around a note to show it is alternative i.e. it is played on both staves at the same time. I tried it with text, but then it never fits around the note on the screen and the print preview because of the invisible anchor.
There is not any built-in method for doing this.
Well is there any other way of doing this like with a different font?
You would place a text entry that is centred at the next note - pad with spaces as required - check in print preview to make sure it's in the right place...
Just one more question, would you recommend muting the note with the paranthasis or not?
That depends entirely on the work itself and your preferences...
For piano, all but one should be muted.
If you were writing a note that is out of range for most players of a certain instrument, you might want to draw a chord consisting of the original note and the same nominal note in another octave. In that case, your brackets signify the alternate note, but you can't mute just one note in a chord. The workaround would be to mute the entire chord, but have the correct note playback in a hidden staff, where you've only notated the original note.
If you wanted to signify a "ghost" note, you might want to consider the X notehead.
True, but you can fake it. <link> (https://forum.noteworthycomposer.com/?topic=5732.msg37370#msg37370)
Even less clutter like this: