Ideally....thin single seedlings from a community pot each separately to a small pot - too large and the soil stays too damp. Then move to a larger pot after the small pot shows roots at the bottom. Some plants are exceptions - if they resent disturbance or are root crops like carrots where the main root needs to be left undisturbed. My max for a seedling is a 4" pot, then usually to ground or final destination. In your case if you are going to have several plants in a Large pot, I would direct sow and thin to desired spacing, unless the large pot needs to be outside and you want to sow inside etc.
Ideally....thin single seedlings from a community pot each separately to a small pot - too large and the soil stays too damp. Then move to a larger pot after the small pot shows roots at the bottom. Some plants are exceptions - if they resent disturbance or are root crops like carrots where the main root needs to be left undisturbed. My max for a seedling is a 4" pot, then usually to ground or final destination. In your case if you are going to have several plants in a Large pot, I would direct sow and thin to desired spacing, unless the large pot needs to be outside and you want to sow inside etc.