If the "vouchers" are multiple 2020 form 1040ES forms...it's because the software "thinks" you might need to make estimated tax payments towards your 2020 tax return due next year when you prepare it in early 2021.
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That can happen in a couple of circumstances, even if you are getting a refund this year....but if you are sure they are not needed (i.e you won't owe a significant amount next year at tax time), you don't have to use them. The IRS doesn't know they were created and doesn't expect to see those payments...but you should review what you expect to happen this year just in case the amounts are reasonable.
why might they show up?
1) you made an estimated tax payment this year for an unusual income item. The software default uses the same income again to predict next year...
2) You might have started into the estimated tax calculations in the "Other Tax Situations" page, and either terminated it without completing it fully, or mis-entered some income items.
Filing and paying those 1040ES forms is not necessary of you have a handle on how much in taxes you need to have withheld for next year, and don't think they are needed .
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
