Sometimes multiple files have to be sent to a recipient. Those files can be placed in a ZIP files and the ZIP file encrypted instead of sending multiple password protected files.
Right click on the files or folder you wish to compress and encrypt.
The Archive format to Zip (or use 7z if both you and your intended recipient use 7zip), then change the encryption method to the robust AES-256, thirdly enter your password. Then click OK. The rest of the options can be left as default.