How to make it so that when tapping on one column, others are not highlighted?

You can create a custom UITableViewCell and override methods to manage the selection state.

Here's an example:

import UIKit

class CustomCell: UITableViewCell {

    override func setSelected(_ selected: Bool, animated: Bool) {
        // Do not call super.setSelected
        // Manage appearance yourself if necessary
    }

    override func setHighlighted(_ highlighted: Bool, animated: Bool) {
        // Do not call super.setHighlighted
        // Manage appearance yourself if necessary
    }
}

In tableView(_:cellForRowAt:), you should use this custom class:

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    guard let cell = tableView.dequeueReusableCell(withIdentifier: "CustomCell", for: indexPath) as? CustomCell else {
        fatalError("The dequeued cell is not an instance of CustomCell.")
    }
    // Configure the cell
    return cell
}

You can also set UITableViewCell.selectionStyle to .none:

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "CellIdentifier", for: indexPath)
    cell.selectionStyle = .none // Disables the default highlight on tap
    // Configure the cell
    return cell
}