They've completely changed the withholding system, so if you file a new Form W-4 now, you'll have to use the new 2020 form:
https://www.irs.gov/pub/irs-pdf/fw4.pdf
On the 2019 and prior W-4, what caught out a lot of people was the check boxes for Single, Married, or "Married, but withhold at higher Single rate." If you're married but both make a decent income, then you were supposed to the check the "Married, but withhold at higher Single rate" box. Otherwise, if you checked the Married box, then your employer would withhold taxes based on the Married Filing Jointly tax brackets but they won't know about the other spouse's income so the tax bracket would be too low. e.g. 130k + 70k = 200k which should be in the 24% tax bracket. But if you both check the Married box, one employer will tax the 130k in the 22% bracket and the other employer will tax the 70k in the 12% bracket, so it won't be enough and you'll owe taxes on your tax return.
Anyway, they've removed this option on the new 2020 W-4 as well as the number of allowances/exemptions system. You can read Publication 15-T if you want to know how to calculate the taxes withheld:
https://www.irs.gov/pub/irs-pdf/p15t.pdf
Now they want you to use the online calculator at
www.irs.gov/W4App , or the manual worksheet at the end of Form W-4, or there is a checkbox in Step 2 that says "If there are only two jobs total, you may check this box. Do the same on Form W-4 for the other job. This option is accurate for jobs with similar pay; otherwise, more tax than necessary may be withheld". If you do that, your employer will use the higher tax withholding tables on the right side of Pub 15-T page 6.
Personally, I check the step 2 box but I also keep a spreadsheet with all my paychecks, taxes, stocks, etc so that I can calculate my taxes and adjust my withholding if necessary.