Hello Ryan 

Try this way 

Re-add the Tax Field in Developer Mode:

• Go to the form view where the tax field was originally displayed.
• Activate Developer Mode.
• From the "View" menu, select "Manage Views."
• Find the view that originally contained the tax field (usually the account. move or sale. order view).
• Re-add the tax field using XML or directly in the UI by choosing "Edit View Form."
• Save your changes, and verify that the tax field is visible again.

Hide the Tax Field in the PDF Only:

• Go to the relevant report template for the PDF quote (usually in Settings > Technical > Reports).
• Find the template and locate the section where the tax field is being rendered (likely in the sale, order, or account). Move the template.
• Wrap the tax field in a condition that makes it invisible in the PDF. You can use the t-if attribute, such as <t t-if="False">, to hide the field from rendering without removing it from the database.

Save and Test: Save the updated report template, then generate a PDF quote to confirm the hidden tax field.