Hello,

Although, there isn’t a direct option available for that.

But we have tried out a Custom CSS way to adjust that like you want, here is how it previews after the CSS applied: https://ibb.co/LdGsF7R

This was the CSS applied in this regard under the Dashboard >> Theme Settings >> Custom CSS >> Global CSS section area:

table.variations tr {
    display: inline-grid !important;
}

table.variations .value select {
    width: 26.5em !important;
    max-width: 26.5em !important;
}

Best Regards