Name length of a $_POST parameter and variable colours

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I could not understand this very clearly but you can find some info here:

Dynamic link meaning of colors

Hello, There are 3 colors for the 3 states of the expressions. Orange: Your expression is selected from the data picker and no formatting is applied [Screenshot 2021-02-16 at 11.02.37] Blue: You have clicked the expression in the value input (so it’s a selected state) and you can apply formatting to this specific expression [Screenshot 2021-02-16 at 11.02.47] Green: You have applied formatting to your expression [Screenshot 2021-02-16 at 11.03.00]

I don't bother with the colour anyways as they don't help in any way.