(I wasn’t sure where to post this, but it is definitely a shortcoming of the application, hence the bug report. - I did check for duplicates, but it seems no one has reported this yet)
Currently you can set either Sunday or Monday as the “First Day of Week”:
However Saturday is actually the first day of the week in about 15 countries. Please check the link to see some of them:
Currently I am unable to work with the inline dates as well as the little calendar component properly and efficiently. TickTick and other apps already have all 3 options, but Dynalist is one of the ones which doesn’t. Please consider adding Saturday to this setting in one of the updates, hopefully soon.