It is not recommended to delete the default library which was created by Sharepoint itself - it will have some side effect to the setup.
One of the most advice is to not touch default SharePoint libraries such as:
- Form Templates
- Style Library
Hide SharePoint library or list
What should we do in this scenario?
For your scenario, you can create the folder with the name something like 'Forms Templates Folder' or appending just with 2
With these being said, still, we can hide these libraries (deletion is not recommended) using the following ways:
Using PnP Provisioning template:
Set-PnPList -Identity "Demo List" -Hidden $true
<pnp:ListInstance Title="Style Library" Description="Use the style library to store style sheets, such as CSS or XSL files. The style sheets in this gallery can be used by this site or any of its subsites." DocumentTemplate="" TemplateType="101" Url="Style Library" TemplateFeatureID="00bfea71-e717-4e80-aa17-d0c71b360101" Hidden="true">
<pnp:ContentTypeBinding ContentTypeID="0x0101" Default="true" />
<pnp:ContentTypeBinding ContentTypeID="0x0120" />
Using SharePoint Designer