Add A blueprint widget A to blueprint widget B and adjust A's large hour in B, the child image in A It doesn't scale by the size of A.

Add A blueprint widget A to blueprint widget B and adjust A’s large hour in B, the child image in A It doesn’t scale by the size of A.

[…]and adjust A’s large hour in B

I’m sorry, but what are you trying to do? Unfortunately, I found the description barely comprehensible. Could you perhaps post a couple of screenshots, one with the current widget hierarchy and current result and the desired result.