src/SectionField/Form/Form.php
private function getSectionConfig(string $forHandle): SectionConfig
    {
        return $this->sectionManager->readByHandle(
            FullyQualifiedClassName::fromString($forHandle)->toHandle()
        )->getConfig();
    }
private function getSectionConfig(string $forHandle): SectionConfig
    {
        return $this->sectionManager->readByHandle(
            FullyQualifiedClassName::fromString($forHandle)->toHandle()
        )->getConfig();
    }
A section can be summoned by either it's handle: 'someCoolHandle'
or it's fully qualified class name: 'Vendor\Entity\SomeCoolEntity'
Make sure we fetch the entity config so we can get the FQCN from there
@param string $forHandle
@return SectionConfig