Your $5.00 trial credit was not lost. The first Hobby invoice is always charged in full, and the carried-over trial credit applies as a discount on your next billing cycle.

ok, then why cant i see how much credit i have left?

Your $5.00 credit is still on your account. You can view it at Workspace Settings > Billing, where your credit balance and promotion details are displayed.

Why would it be removed from the main page of the project , doesnt make sense.

plus in that page it only shows the monthly doesnt show useage of the credit or how much its left

The trial dashboard shows credit prominently because it's your primary usage limit, but once you're on a paid plan the billing model shifts to a monthly subscription cycle, so the credit balance moves to Workspace Settings > Billing. Your $5.00 credit is confirmed on your account and will be applied automatically to your next invoice.

Yes but it makes no sense to not be able to SEE the current usage

You can see your current resource usage for the billing period at Workspace > Usage, which shows how much of your $5 included usage you've consumed so far.