PDF Format Dropdown on quote does not show Quote and Invoice options,
After print as pdf, error is displayed in pdf file as,
Tcpdf class for this module and action has not been implemented.
PDF Format Option dropdown value was set different then default value into custom/include/language/en_us.lang.php (please check in the file)
'Single_User' => 'Single User',
'Multi_user' => 'Multi User',
This might be happen as of some plugin that you have installed. And if you want to change the name of that dropdown then you need to change into some other places too.
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