why I can't find lpm_latch in quartus 18?

Hi,

1. Open the .bdf file( already inserted the LPM_LATCH & edited the width parameter refer the screenshot)
2. "File"->"Create & Update"->"Create HDL design file from current file.."
3. check the .v file

let me know if this has helped to resolve your issue.

Regards.

Vikas