Hello Gyuseon,
I'm Ibhadighi and I'd happily help you with your question. In this forum, we are Microsoft consumers just like yourself.
You can find the “More Error Bars Options” and “Format Error Bars” options by following these steps in Excel:
Click anywhere in the chart.
Click the Chart Elements button next to the chart, and then check the Error Bars box.
To change the error amount shown, click the arrow next to Error Bars, and then pick an option.
Pick a predefined error bar option like Standard Error, Percentage or Standard Deviation.
Pick More Options to set your own error bar amounts, and then under Vertical Error Bar or Horizontal Error Bar, choose the options you want. This is also where you can change the direction, end style of the error bars, or create custom error bars.
Please let us know if you need more help.
Best Regards,
IBHADIGHI