The Biopolymer toolbar is missing on ChemDraw 18.1
The legacy biopolymer toolbar has been removed from ChemDraw 18.1. However, all sequences (peptide, DNA/NA and ad-hoc) can be drawn using the newer HELM monomer toolbar.
The keyboard shortcut for drawing the 20 standard amino acids and 4 standard DNA/RNA bases have not been preserved.
This functionality is far less valuable when the monomer toolbar supports hundreds or thousands of monomers
This information is available through the ChemOffice/ChemDraw 18.1 Release Notes on your download center.