Condensation is part of the natural water cycle inside of the Jar and is a great indicator of how suitable the position of your Jar is. Ideally, one side of the Jar will be fogged up during the day. The plant will need about a week to acclimatise to a new spot.
If the Jar is completely foggy after 2 weeks, it is probably because the temperature in that spot changes often. Try moving the Jar somewhere with a more stable temperature.
If this does not do the trick, leave the Jar slightly open for a day or two to balance the humidity. Or open and lift off the top to wipe away the moisture with some clean paper towels.
We do our best to prepare your Jar for the dangers transport poses to a fragile product. However, if your Jar has been jostled or shaken too much, soil can spill onto the glass. It would be a shame to let that spoil your view! This can easily be resolved by opening up the Jar and wiping the inside with some clean paper towels.