How can we split the $25 free bet into small?

I already got a balance so whenever I select any smaller amount than $25 for a bet it goes from the balance, not from the free bet.

But when I click the free bet, the whole $25 gets selected.
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I think I also experience the same thing too when I was trying to place a bet. Because I also have some balance already in my whale account, so I trying to used some my free bet on the game I want to bet just like $3 or $4 but unfortunately as soon as I click on the place bet button what I saw was the whole $25 free bet, and I was given a possible win amount. However, am just hoping for the game to end as predicted, so that it'll enable me to achieve the possible win.