Default switch config under ROS

There are some Mikrorik devices that positioned as switches (https://mikrotik.com/products/group/switches). If we talk about these that can be ROS-booted, I wonder which is the default (out-of-box) config for them: all ports are connected under one bridge (so switch can be used as unmanaged switch right away by connecting clients), or no bridge is configured, or maybe something else approach? For example, what’s the config are default for CRS326-24G-2S+RM and CRS312-4C+8XG-RM nowdays (that is, in recent ROS)?

More broad question can be is there any default config library for each device (or device group), better by ROS versions?

Thank you in advance!

Why is it so important to know the default config ?