An excavator includes a lower traveling structure, an upper swing structure swingably mounted on the lower traveling structure, an attachment attached to the upper swing structure, a display device, and a hardware processor. The display device is configured to display multiple ranges including a first range and a second range lower in stability degree than the first range in the working range of the attachment such that the multiple ranges are distinguishable. The hardware processor is configured to determine a setting with respect to the multiple ranges.