Tell me, please, whether it is possible to remove the "Count" column when building a table, which is added by default in the "Metrics"
Having a data table without metrics is currently not possible. However, there is a plugin by @fbaligand attached to the feature request here:
Yes, you can do it using kibana enhanced-table plugin, which is like a data table but with enhanced features 
You can for example hide any column, like "Count" column.
You can get the plugin here :