Adding a country size dropdown selection to your size chart is easy with the following steps:

Edit your Table: Start by accessing the table you want to edit.
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Enable Country Size: In the table settings, look for the option to enable country size. Make sure to enable it.
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Add Country: After enabling country size, click on the "Add Country" button to begin the customization process.
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Select the Country: Choose the specific country for which you want to add size options.
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Default Country: You can select a default country from the list if needed. This will be the initial choice when customers view the table.
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Inject Position: Decide whether you want this country's size dropdown to appear at the beginning or end of the table.
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Enter Sizes: For the selected country, enter the available sizes into this field.
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Save and Repeat: Don't forget to save your changes. If you want to add size options for more countries, simply repeat the steps above.