machine stuck on zigzag and wont sew straight

My old imperial sewing machine dial is set for a straight normal stitch. However it keeps doing zigzag. The two settings are side by side on selection dial but not sew straight stitch

crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2889612:0crwdne2889612:0 0

crwdns2942205:01crwdne2942205:0:

Hi @dorothytaylor,

What is the model number of the sewing machine?

crwdns2934271:0crwdnd2934271:0crwdne2934271:0

crwdns2934285:0crwdne2934285:0