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You’ll need to check off Contribution Amount in your config (on the Webform). Then (in your webform components screen) you can:


drag it to where you want to move it to on your form
set it to a specific amount and hide it
use conditionals to set it to a specific amount
with some additional config you can also pass it into the form as a parameter 


Webform CiviCRM only takes the config portion (payment processors, thank you and receipting, financial type) bits from CiviCRM Contribution form.