It doesn't show the exact size... but you can roughly calculate it using the standard formula:
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the size of the tx will be: 180 bytes per input + 34 bytes per output + 10 bytes.
That was what I was asking and I appreciate your will you tried to help me first!
I understand the calculation you wrote is a rough calculation that provides an estimated result for the tx, but it may be different in real because Mycelium tries to optimize the transaction. Well, even an estimated result is better than having no idea so I thank you!Mycelium starts with the oldest output and adds more until enough value for the transaction was added, then goes through the outputs and checks whether some can get removed again.
...and if you wanted to send 16, it would choose the first four ones then remove nothing because 5 + 5 + 1 + 5 is 16 exactly. I hope I understand right, thank you! I could appreciate a feature to select my output option and also information about the exact fee before transaction, though.