Hello dears,
After I connect to my Tello drone, I press the regular takeoff icon but there is no slide button
when I use the "Throw & go" option the drone works great.
I have samsung s8 plus
Any suggestions?

Hi Shahar,
We are so sorry to reply you late. In regard to your problem, have you ever try to reinstall the Tello APP? Samsung s8 plus is not compatible with Tello. Could you please try another compatible device and fly it?
Here are some devices which we have confirmed that are compatible with Tello.
iOS
Requires iOS 9.0 or later. Compatible with iPhone 5s, iPhone SE, iPhone 6, iPhone 6 Plus, iPhone 6s, iPhone 6s Plus, iPhone 7, iPhone 7 Plus, iPhone 8, iPhone 8 Plus, iPhone X, iPad mini 4 and iPad mini 4 Wi-Fi + Cellular.
Android
Android version 4.4.0 or later. Compatible with Samsung S7，Samsung S6 edge，Samsung S5，Samsung Galaxy note 4，Samsung Galaxy note 3，Huawei Honor 8，Huawei Honor 9，Huawei P8 Max，Huawei P10，Huawei Honor V8，Huawei P9，Huawei nova2，Xiaomi 6，Xiaomi Note3，Redmi 4A，OnePlus5，vivoX6，Google Pixel1 XL，Google Pixel2.
I hope my answer can help you. Good luck.

Try using an after market application for the Tello such as Tellofpv or Atellopilot, I use a Samsung Note 9 with Tellofpv and do not have any compatibility issues.

Have you simply tried reinstalling the app?