Freeze object when reached point

You can achieve this effect in Adobe After Effects by using expressions so your text boxes automatically stop when they reach a specific point on the screen and change their appearance without creating duplicate layers. The idea is to animate all text boxes sliding from right to left as usual, then add an expression to the Position property that checks the X-axis value; once the text reaches the X position of your green line, the expression locks it in place so it appears frozen for a set time or indefinitely. At the same time, you can use a similar condition on the Scale property to make the text bigger when it reaches that point, creating a bold or highlighted look. While expressions cannot directly toggle a font to bold unless you use variable fonts or multiple layers, increasing scale gives a similar visual emphasis.